Damrongsak, Pattareeya

Preferred name

Alternative Name

Damrongsak, P.

Main Affiliation

School of Science

pattareeya.da@kmitl.ac.th

Now showing 1 - 10 of 20

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Enhancement of fluorescence in inorganic dyes by metallic nanostructured surfaces
(2016-01-01)
Locharoenrat, Kitsakorn
;
Damrongsak, Pattareeya
We have studied the influence of shape and chemical content of metallic nanostructures (gold-palladium core-shell nanorods, gold nanobipyramids and single-crystalline porous palladium nanocrystals) on the luminescence of Rhodamine 6G and Coumarin153 dyes. The changes found in the emission intensity are attributed to different proportions of the dyes and the metallic nanostructures. The enhancement of the fluorescence observed by us for the cases of Rhodamine 6G with gold-palladium core-shell nanorods and Rhodamine 6G with gold nanobipyramids suggests their promising plasmonic properties. This may be regarded as a preliminary step towards development of the fluorescent probes possessing high photo-sensitivity.
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Effects of gold nanoparticles on fluorescence polarization and emission spectra of rhodamine 6G solution
(2018-01-01)
Damrongsak, Pattareeya
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Rammarat, Ekkachai
;
Locharoenrat, Kitsakorn
Fluorescence polarization and emission spectra of Rhodamine 6G solution with gold nanoparticles have been studied. It is found that the emission intensities tend to be low when the gold nanoparticles are added into the solution partly due to the energy transfer from the Rhodamine 6G to gold nanoparticles. The fluorescence polarization increases as the concentration ratio of the gold and Rhodamine 6G is more than 124 and decreases as the ratio is about 1115. The enhancement and reduction of fluorescence polarization values are understood as the shortening of the fluorescence lifetime and a temperature effect from the heating of gold nanoparticles, respectively.
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Kinetics of dye removal using Fe3O4 nanoparticles and pulsed white-LED illumination
(2019-01-01)
Damrongsak, Pattareeya
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Klongratog, Bhanupol
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Hoomsuk, Sirichai
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Locharoenrat, Kitsakorn
Removal of dyes with the aid of photocatalytic nanomaterials illuminated with continuous-light sources has been given substantial attention in the recent years. In the present work we study the efficiency of dye degradation using some alternative photocatalytic nanoparticles under condition of pulsed illumination. Our specific purpose is to investigate the removal of rhodamine 6G dye basing on suspended Fe<inf>3</inf>O<inf>4</inf> solution. The experiments are carried out in the batch mode when the effect of the exposition time (ranging from 30 to 150 min) on the dye removal is examined under both continuous and pulsed white-LED illuminations. Different pulsed-light frequencies and duty cycles are tested. We estimate the concentration of rhodamine 6G in the mixed solution following from its absorption spectrum measured with a UV-Vis spectrometer and determine in this manner the percentage of dye removal. Our main conclusion is that Fe<inf>3</inf>O<inf>4</inf> nanoparticles enable removing efficiently the rhodamine 6G dye under pulsed white-LED illumination. In particular, more than 90% of the dye is removed when the duty cycle is equal to 25% and the frequency to 30 kHz. The equilibrium state of this process is achieved in about 60 min.
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Photosensitised silicon solar cells: progress and challenges
(2025-08-14)
Danos, Lefteris
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Fang, Liping
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Dzurňak, Branislav
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Damrongsak, Pattareeya
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Meissner, Dieter
We present historical context and review recent advances in the realisation of a photosensitised silicon solar cell, highlighting key theoretical and experimental developments. Emphasis is placed on the importance of electrostatic near-field interaction between the transition dipole moments of the luminophore and electron-hole pairs in the silicon crystal at a distance of a few nanometres. The very fast energy transfer then resembles the Förster resonance energy transfer between two molecules. Photon tunnelling via the evanescent field of the excited molecule (‘optical near field’) into optical states in silicon occurs at somewhat larger separation between the molecule and silicon, of the order of tens of nanometres. Accessing the critical Förster regime relies on oxide-free silicon surfaces and the covalent attachment of dyes, enabling efficient passivation and precise control of interface chemistry. Realising a complete photosensitised silicon solar cell remains a challenge and we outline promising directions and review recent progress that brings this goal closer to reality.
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Engineering Education Roadmap of the Future Trend of Basic Metaverse based on VR with cooperation between the government and the private sector
(2022-01-01)
Purahong, Boonchana
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Anuwongpinit, Thanavit
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Kanjanasurat, Isoon
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Chansuthirangkool, Manit
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Singto, Kamphon
This article presents an educational roadmap of future trends of Metaverse in VR-based by collaborating between the School of Engineering, King Mongkut's Institute of Technology Ladkrabang (KMITL) with iMAKE company to make a part-time learning plan. The objectives were to measure the achievement and evaluate satisfaction with the development of part-time learning skills in technology on the topic 'Basic Metaverse based on VR'. The sample group was students in a double-degree bachelor's degree program (Dual Degree) between the School of Engineering and the Faculty of Science, KMITL: Bachelor of Engineering (IoT System and Information Engineering) and Bachelor of Science (Industrial Physics) for 16 students by selecting a specific sample group, the engineering education program has a systematic process. The results showed that the achievement of part-time learning skills development in technology on the topic 'Basic Metaverse based on VR' higher than the set criteria 74 %, the overall satisfaction is at a very good level, the mean satisfaction was 4.636 and the sample standard deviation was 0.39.
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Effect of Adsorption Characteristics of Rhodamine 6G Dye Solution in Fe3O4 Magnetic Nanoparticles on Fluorescence Quantum Yield
(2019-01-01)
Phoemphoonthanyakit, Suwaphit
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Seeharaj, Panpailin
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Damrongsak, Pattareeya
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Locharoenrat, Kitsakorn
In this work, the use of Fe<inf>3</inf>O<inf>4</inf> magnetic nanoparticles in the adsorption of rhodamine 6G solution was evaluated via absorbance and fluorescence spectroscopy using the UV-Vis spectrometer. The adsorption mechanism of rhodamine 6G on Fe<inf>3</inf>O<inf>4</inf> was determined with respect to the adsorbent dosage (2.5-10 mg/L) and treatment time (0-150 min). The experimental data revealed that the fluorescence quantum yield of rhodamine 6G was inversely proportional to the percentage of dye removal. The highest efficiency of dye removal was obtained at 10 mg/L Fe<inf>3</inf>O<inf>4</inf>, and the adsorption capacity was about 150 mg/g, together with a reduced treatment time of 30 min, owing to active adsorption of Fe<inf>3</inf>O<inf>4</inf>. We believe that our study makes a significant contribution to the literature because Fe<inf>3</inf>O<inf>4</inf> magnetic nanoparticles were found to be able to quench rhodamine 6G dye molecules, which will aid in eliminating toxic and hazardous pollutants from dye wastewater, which are otherwise detrimental to the environment and human health.
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Highly Hg2+-sensitive and selective fluorescent sensors in aqueous solution and sensors-encapsulated polymeric membrane
(2016-01-01)
Kraithong, Sasiwimon
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Damrongsak, Pattareeya
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Suwatpipat, Kullatat
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Sirirak, Jitnapa
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Swanglap, Pattanawit
Two Hg2+ chemosensors, rhodamine B hydrazide (RBH) and rhodamine 6G hydrazide (R6GH), were synthesized by a single step. In the presence of Hg2+, both of the sensors RBH and R6GH exhibited highly sensitive OFF-ON fluorescence enhancement. Importantly, the sensors showed a selective binding to Hg2+ over other common metal ions such as K+, Na+, Fe3+, Ca2+, Cu2+, Ag+ and Pb2+ in aqueous solutions. The OFF-ON fluorescence enhancement upon Hg2+ binding could be ascribed to conformational change of the spirolactam moiety of the rhodamine fluorophore through a spirolactam ring opening process. Furthermore, encapsulation of the sensors by polymeric membranes (PMMA) provided high selectivity and high sensitivity, especially for the sensors-encapsulated polymeric membrane RBH that showed an extremely low detection limit (0.2 ppb), which was 245 times lower than the sensor RBH in aqueous solution. In addition to fluorescence enhancement, the presence of Hg2+ also induced a noticeable color change from colorless to pink for the sensors dissolved in aqueous solution (10% v/v MeOH/water). The detection limits of sensor RBH and R6GH in both formats were in the range of 10-9-10-7 M of Hg2+ and were sufficient for on-site Hg2+ detection in the environmental and biological systems such as ground water, drinking water and edible fish. In particular, the extremely high sensitivity of the novel sensors-encapsulated polymeric membrane RBH could pave the way for development of a real time Hg2+ detection portable device.
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Automated method for measuring the energy gap of p-n junction semiconductor diodes with the temperature-voltage method
(2021-03-01)
Klongratog, Bhanupol
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Somdock, Nuttakrit
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Damrongsak, Pattareeya
An automated system for measuring the energy gap E g of a p-n junction semiconductor diodes was presented in this study. The system, based on temperature-voltage (T-V) measurement, was designed and developed as a teaching tool to support teaching for undergraduate students. The energy gap of diodes was measured by varying the diode temperature from 273 to 343 K and by measuring the voltage drop across the diode while the bias current of diodes was kept constant at a specific value. In the proposed system, an Arduino UNO R3 microcontroller was employed to automatically acquire the temperature and voltage drop across the diode. T-V data were plotted, and then the slope and intercept were used to calculate the energy gap by a simplified diode equation. In this system, the temperature and voltage of the two diodes were measured simultaneously at different constant bias currents in the range of 10 μA-10 mA. The average E g value of 1.22 eV obtained in this work is in good agreement with that reported in the literature.
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Rhodamine 6G and Au–Pd core–shell nanorods: Fluorescence enhancement for detection of mercury
(2018-01-01)
Rammarat, Ekkachai
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Kraithong, Sasiwimon
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Wanichacheva, Nantanit
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Swanglap, Pattanawit
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Yindeesuk, Witoon
We show that hybrid organic–inorganic particles are efficient for accurate sensing of mercury ions and following up trace amounts of the mercury pollutions spread in the environment. The process of synthesis of a working substance starts from preparation of rhodamine 6G derivative. Then the dye molecules are bound on the surface of Au–Pd core–shell nanorods. Mercury ions with different concentrations are finally attached onto this fluorescence sensor. Fluorescence emission of the sensor is detected with a luminescence spectrophotometer. The experimental results demonstrate that the fluorescence intensity of one of our sensors, a sensor B, is remarkably enhanced when the mercury-ion concentration increases from 0 to 15.5 µM. The limit of detection of the ions is as low as 20.6 nM. The working mechanism of our fluorescence sensor can be explained through the fluorescence-energy transfer and the plasmonic effect associated with spirolactam forms of rhodamine and conducting bimetallic nanoparticles.
1
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The electrochemical measurements investigation of NiCo2O4for electrode materials of energy storage devices by using digital holography technique
(2021-01-01)
Prakobsang, Tawipon
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Saei, Worawee
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Kongsubto, Thee
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Ruttanapun, Chesta
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Buranasiri, Prathan
The electrochemical properties of NiCo2O4for using as electrode materials for the potential applications have been investigated by electrochemical measurement which composed of cyclic voltammetry (CV) and galvanostatic chargedischarge (GCD). These processes are generating the ion exchange between the electrode and electrolyte, wherein induce the surface change of the interface. Especially, since in the cycle ability measurement using the potentiostat needed to repeat the cycle into the electrode for many times, the effective of the electrode is reduced. In this research, digital holographic technique was used to investigate the different properties of interface of the NiCo2O4 electrode while operating under the various electrochemical techniques. In our DH recording, the surface change of the electrode was expose at the difference potential scan rate at 1, 5, 10, 50, 100 and 200 mV/s of CV, and the difference current densities at 1, 2, 3, 5, 10 and 20 A/g of GCD and vary times of cycle ability test every 50 cycle times to 1000 cycles. In the end the reconstructed DH images of the electrode have been used to analyze the results from electrochemical measurement.
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Damrongsak, Pattareeya

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